der Maler
painter
An artist who paints pictures.
Vincent van Gogh ist einer der berühmtesten Maler der Kunstgeschichte.
Vincent van Gogh is one of the most famous painters in art history.

painter
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painter
An artist who paints pictures.
Vincent van Gogh ist einer der berühmtesten Maler der Kunstgeschichte.
Vincent van Gogh is one of the most famous painters in art history.

The noun 'der Maler' (painter) is derived directly from the verb 'malen' (to paint). It therefore refers to a person who paints—either as an artist or as a tradesperson.
Wer hat dieses wunderschöne Porträt gemalt?
Who painted this beautiful portrait?
You can tell from the context whether the artist or the tradesperson is meant. Words like 'Kunst' (art), 'Galerie' (gallery), or 'Gemälde' (painting) point to the artist, while 'Wand' (wall), 'streichen' (to paint), or 'renovieren' (to renovate) refer to the tradesperson.
Der Maler hat die Fassade des Hauses neu gestrichen.
The painter repainted the facade of the house.
In a trades context, the word is often used with certain verbs. Typical phrases are 'einen Maler rufen' (to call a painter), 'einen Maler beauftragen' (to hire a painter), or 'der Maler kommt vorbei' (the painter is coming by).
Für die Renovierung müssen wir einen Maler beauftragen.
We need to hire a painter for the renovation.
artist
'der Künstler' and 'der Maler' can both refer to a person who makes art. The important difference is: 'Künstler' is the broader term. A 'Künstler' can paint, make music, write, or create sculptures. 'Maler' is more specific when someone paints pictures. In addition, 'Maler' can also mean a tradesperson who paints walls or facades. Learners may confuse the words because a 'Maler' in the artistic sense can also be a 'Künstler'. If the type of art is not important, 'Künstler' fits. If it is specifically about painted pictures or painting walls, 'Maler' fits.

Der Maler streicht nächste Woche unser Wohnzimmer weiß.
The painter is painting our living room white next week.
Der Künstler zeigt in der Ausstellung Bilder, Fotos und kleine Figuren.
The artist is showing paintings, photos, and small figures in the exhibition.